Secure context
This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

authenticatorSelection, an optional property of the PublicKeyCredentialCreationOptions dictionary, is an object giving criteria to filter out the authenticators to be used for the creation operation.


authenticatorSelection = publicKeyCredentialCreationOptions.authenticatorSelection


An object with the following properties:

A string which is either "platform" or "cross-platform". The former describes an authenticator which is bound to the client and which is generally not removable. The latter describes a device which may be used across different platform (such as a USB or NFC device).
A boolean which indicated that the credential private key must be stored in the authenticator, the client or in a client device. The default value is false.
A string qualifying how the user verification should be part of the authentication process. The values may be: The default value is "preferred".

The authenticator used for the creation of the public key credential must comply with the requirements.

Note: See PublicKeyCredential.isUserVerifyingPlatformAuthenticatorAvailable() which resolves to true when a user-verifiying platform authenticator is available.


var publicKey = {
    authenticatorAttachment: "cross-platform",
    requireResidentKey: true,
    userVerification: "required"
  challenge: new Uint8Array(26) /* this actually is given from the server */,
  rp: {
    name: "Example CORP",
    id  : ""
  user: {
    id: new Uint8Array(26), /* To be changed for each user */
    name: "",
    displayName: "John Doe",
  pubKeyCredParams: [ {
    type: "public-key",
    alg: -7 } ]

navigator.credentials.create({ publicKey })
  .then(function (newCredentialInfo) {
    // send attestation response and client extensions
    // to the server to proceed with the registration
    // of the credential
  }).catch(function (err) {


Specification Status Comment
Web Authentication: An API for accessing Public Key Credentials Level 1
The definition of 'authenticatorSelection' in that specification.
Recommendation Initial definition.

Browser compatibility

ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Chrome Full support 67Edge Full support ≤79Firefox Full support 60IE ? Opera ? Safari Full support 13WebView Android No support NoChrome Android Full support 67Firefox Android ? Opera Android ? Safari iOS Full support 13.3Samsung Internet Android No support No


Full support
Full support
No support
No support
Compatibility unknown
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.

See also